Read from the World of Warcraft client build files.
How Windfire Legplates Compares
Who It Suits
Plate is the armor type Death Knight, Paladin and Warrior wear. With Strength or Intellect, Windfire Legplates suits Arms, Fury and Protection Warrior; Holy, Protection and Retribution Paladin; Blood, Frost and Unholy Death Knight.
Transmog Sets
Windfire Legplates is part of the transmog set Vestments of Winged Triumph (Paladin only). The other 16 pieces:
Built from the World of Warcraft client build files and recorded Auction House snapshots.
Where Windfire Legplates Fits
Other Items Named Windfire Legplates
6 other items in the current build are also called Windfire Legplates. Same-name entries are usually a different rank, faction, quest stage or reward track of the same object.
Blizzard numbers items as they are created, so the named items next to ID 103907 (103901 to 103912) were usually added in the same batch as Windfire Legplates: the same quest line, zone, vendor or reward set.